var J_maps_bt=document.getElementById('J_maps_bt');
	var J_maps_box=document.getElementById('J_maps_box');
	var J_maps_li=J_maps_box.getElementsByTagName('li');
	time=null;
	J_maps_bt.onclick=function()
	{
		
		target=J_maps_li.length*28
		if(J_maps_box.offsetHeight==target)
		{
			var target=0;
		}else
		{
			 var target=J_maps_li.length*28;
		}
		clearInterval(time);
		time=setInterval(function(){
			ispeed=(target-J_maps_box.offsetHeight)/8;
			ispped=target==0?ispeed=Math.floor(ispeed):ispeed=Math.ceil(ispeed);
			if(J_maps_box.offsetHeight==target)
			{
				clearInterval(time);
			}
			else{
				J_maps_box.style.height=J_maps_box.offsetHeight+ispeed+'px';
			}
		},30)
	}